46. A. politely
B. carefully
C. vigorously
D. violently
47. A. at
B. on
C. to
D. from
48. A. though
B. when
C. where
D. which
49. A. crossing
B. cross
C. being crossed
D. to cross
50. A. on time
B. in time
C. at a time
D. at times